中文摘要：

采用溶液燃烧合成Mg2＋掺杂LaFeO3超细粉体,并利用XRD、SEM、BET和UV-VIS分析Mg2＋掺杂量对合成粉体的物相组成、微观形貌和光催化性能的影响。结果表明：Mg2＋取代Fe3＋形成LaFe1-xMgxO3（0≤x≤0.2）有限型固溶体。当掺杂量为0.1时（x=0.1）,合成粉体具有最大的比表面积（43.46m2/g）和较小粒径（径向和长度方向分别为100nm和150nm）,因此具有最佳的光催化性能,在高压汞灯180min照射下,对甲基橙溶液（10mg/L）的降解率达75.2%,与纯LaFeO3的相比,光降解率增加26.5%,且光催化反应符合一级动力学方程。

英文摘要：

Mg2＋ doped La Fe O3 ultrafine powders were synthesized by solution combustion method. Effects of Mg2＋ doping content on phase composition, microstructure and photocatalytic performances of the synthesized powders were investigated by XRD, SEM, BET, and UV-Vis. The results show that Mg2＋ substitutes for Fe3＋ to form La Fe1-xMgxO3（0≤x≤0.2） limited solid solution. When Mg2＋ doping content is 0.1, La Fe0.9Mg0.1O3 powder has a maximum specific surface area（43.46 m2/g） and smaller particle size（100 nm and 150 nm in diameter and length direction, respectively）. It has the best photocatalytic ability with photodegradation efficiency of 75.2% to methyl orange（10 mg/L） under high-pressure mercury lamp irradiation for 180 min. It increases 26.5% than that of the pure LaF eO 3 under the same experimental conditions, and the reaction may be described as the pseudo first order kinetics equation.